2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/217052We show that the Wang-Swendsen-Kotecký algorithm for antiferromagnetic $q$-state Potts models is nonergodic at zero temperature for $q=3$ on periodic $3m \times 3n$ lattices where $m,n$ are relatively prime. For $q \ge 4$ and/or other lattice sizes or boundary conditions, the ergodicity at zero temperature is an open question.3 pages, 10774 bytes Latex, NYU-TH-93/04/01High Energy Physics - Latticetext